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수중콘크리트의 수중분리 저항성 향상을 위한 산화마그네슘 및 나노실리카의 활용
전인규 ( Jeon In-kyu ),우병훈 ( Woo Byeong Hun ),유재석 ( Ryou Jae-suk ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
The present study investigates the effect of Magnesium oxide(MgO) and Nano-SiO<sub>2</sub> on the washout resistance of underwater concrete. MgO was added to replace the binder at dosage of 0%, 5%, and 10%, Nano-SiO<sub>2</sub> was added to replace the binder at dosage of 0%, 1%, 2% by weight of the binder. To analyze the washout resistance of underwater concrete, turbidity and pH value was measured using fresh concrete. The results indicated that using MgO and Nano-SiO<sub>2</sub> can increase the washout resistance of underwater concrete. Among them, using both 5% of MgO and 2% of Nano-SiO<sub>2</sub> represented the highest washout resistance performance.
돌로마이트를 치환한 알칼리 활성 고로슬래그 기반 모르타르의 황산염 저항성에 대한 연구
전인규 ( Jeon In-kyu ),김홍기 ( Kim Hong-gi ),류재석 ( Ryou Jae-suk ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
This research provides an analysis of experiments on sulfuric acid resistance of alkali-activated slag mortar with dolomite powder. The results show that the longer the bedding time, the lower the mass change in all specimens. Among them, the mass change in a dolomite replaced specimens are shown to be less than that of a non-dolomite specimens. Since the composition of dolomite reacts with sulfuric acid solution to produce a product, it is thought to play a role in reducing mass reduction.
친환경 무기계 결합형 방수제를 활용한 콘크리트 구조물의 보수공법
김홍기 ( Kim Hong-gi ),이종화 ( Hong Gil-dong ),이근영 ( Lee Geung Young ),전인규 ( Jeon In Kyu ),유재석 ( Ryou Jae-suk ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
Permeation of harmful ions and water to concrete can result in degradation which reduce concrete structures’ life. Various studies have conducted the evaluation of waterproofing additives that extend the service life of concrete elements in structure. This study evaluated a novel and environmentally-friendly waterproof admixture made by the organic and inorganic compounds. Results presented that eco-friendly waterproof admixture improves watertightness of concrete. In addition, it is a strong cohesion between waterproof admixture and concrete matrix.
폴리실리콘 슬러지를 함유한 콘크리트의 염소이온침투 저항성에 관한 연구
김홍기 ( Kim Hong Gi ),우병훈 ( Woo Byeong Hun ),전인규 ( Jeon In Kyu ),박성환 ( Park Seong Hwan ),서아람 ( Seo Aram ),류재석 ( Ryou Jae Suk ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
In this study, poly-silicon sludge was used in replacement with Portland cement as SCMs. Poly-silicon sludge has an ability to improve the durability to the concrete system. Thus, the chloride penetration test of PS specimens was conducted for the confirmation of the durability. From the results, The penetration depth of the plain specimens is deepest, and gradually decreases as PS substitution rate increases.
김홍기 ( Kim Hong-gi ),이종화 ( Lee Jong-hwa ),유동호 ( Yoo Dong Ho ),전인규 ( Jeon In Kyu ),유재석 ( Ryou Jae-suk ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
Mitigating the maintenance or repair expenses of concrete structures and infrastructures is a major problems in the world. The purpose of this research work is to develop the repair material for crack control of cement-based mortars for structural repair in marine or harmful environment. Autogenous self-healing with cement composites has already proved to be an effective alternative method for repair. In this research, repair mortar was prepared with self-healing capsule made by alkali based materials. Self-healing performance of repair mortar was evaluated via ultrasonic pulse velocity and microscope observation. The results showed that the healing performance of the repair mortar with self-healing capsule was significantly enhanced.